Word Origin & History
early 13c., "protector, defender," from O.N.Fr. warant (O.Fr. guarant), from Frankish *warand (cf. O.H.G. weren "to authorize, warrant," Ger. gewähren "to grant"), from P.Gmc. *war- "to warn, guard, protect," perhaps from PIE base *wer- "to cover" (cf. L. vereri "to observe with awe, revere, respect,
fear;" Gk. ouros "watchman," horan "to see;" Hitt. werite- "to see;" see weir
). Sense evolved via notion of "permission from a superior which protects one from blame or responsibility" (c.1300) to "document conveying authority" (1510s). A warrant office in the military is one who holds office by warrant, rather than by commission.
late 13c., "to keep safe from danger," from O.N.Fr. warantir (O.Fr. guarantir), from warant (see warrant
(n.)). Meaning "to guarantee to be of quality" is attested from late 14c.; sense of "to guarantee as true" is recorded from c.1300.